Module exslt 

EXSLT extension function families — the math, date, str, and set namespaces every real-world XSLT stylesheet (and many bare XPath consumers) reach for.

EXSLT lives inside the XPath crate, not inside XSLT, because these are XPath function libraries — they plug into the XPath function dispatcher and are useful even when no stylesheet is involved (e.g. etree.XPath("math:max(...)")).

Each family exposes a dispatch(name, args, idx) function that returns Some(result) if the function name belongs to the family, or None otherwise — letting the XPath evaluator chain through user bindings → EXSLT families → built-ins.

Spec references:

• https://exslt.org/math/
• https://exslt.org/date/
• https://exslt.org/str/
• https://exslt.org/set/

Modules

common

EXSLT common family — http://exslt.org/common

date

EXSLT date family — https://exslt.org/date/

math

EXSLT math family — https://exslt.org/math/

regexp

EXSLT regular-expression family — http://exslt.org/regular-expressions

sets

EXSLT set family — https://exslt.org/set/

str

EXSLT str family — https://exslt.org/str/

Constants

COMMON_NS

DATE_NS

DYN_NS

MATH_NS

REGEXP_NS

SET_NS

STR_NS

XPATH_MATH_NS

XPath 3.0 math namespace — distinct from EXSLT math. Hosts math:pi(), math:sin(), math:pow(), etc. per XPath 3.0 §4.8. XSLT 3.0 §3.6 pre-binds this prefix.

Functions

dispatch

Dispatch an XPath function call to the matching EXSLT family. Returns Some(result) when ns_uri matches one of the EXSLT namespace URIs and the family recognises name; otherwise None, so the caller can fall through to its own table or surface “unregistered function.”